Not exactly sure about your configuration, but keep in mind the MSA works with ALUA, this means the server always talks to the owner controller of a LUN, not to the "non-optimized" partner "standby" controller.
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Not exactly sure about your configuration, but keep in mind the MSA works with ALUA, this means the server always talks to the owner controller of a LUN, not to the "non-optimized" partner "standby" controller.